多谐差相信号在伺服系统频率特性测试中的应用

为了减少伺服系统频率特性测试的测试时间，提高测试精度，选用非均匀功率谱的多谐差相信号作为激励源。该信号具有较低的峰值因子，还可以使激励更加平稳均匀。以某型舵机为例进行实验，结果表明，其测试精度与传统的正弦扫描信号作为激励的情形相比，幅频特性的误差保持在±0.069dB以内，相频特性的误差保持在±0.602°以内，测试时间减少53.3%，在测试过程中系统运行平稳，适合频率特性的快速高精度测试。

Schroeder Phased Harmonic Signal Applied in Frequency Response Test of Servo System

Schroeder phased harmonic signal with non-uniform power spectrum is used as the excitation source of frequency response test for servo system in order to reduce the testing time and improve test precision in the measuring. Using this signal can make the excitation more stationary due to its low peak factor. An experiment was conducted on a steering gear. The experimental results show that the error of amplitude-frequency characteristic kept within ±0.069dB and the error of phase-frequency characteristic kept within ±0.602° and the testing time was reduced by 53.3% compared with the traditional sweep sinusoid signal. The system was stationary in the testing process. This signal is very suitable for rapid and high-precision test of frequency response.